We introduce a new fast stream cipher, JEROBOAM, working with a key of 128 or 248 bits. JEROBOAm was designed to work with eight internal 32-bit registers called multiply-with-carry genrators. These register are very easy to implement in software and produce a sequence of excellent statistical quality. Per contra, one mwc is easily cracked by a lattice reductio algorithm. hence, we are lead to interpose a nonlinear filter between these weak registers and the pseudo-random output.
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